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Plants densely crowded, spreading' in wide patches, with all the 

 parts creeping and overlying- one another. Fronds are decompound- 

 pinnate with elongated and often somewhat irregularly inserted 

 branches. Indehnite elongated branches are alternately and disti- 

 ch o us ly loaded with more or less definite, shortened ones, some of 

 which here and there grow up into indefinite elongated branches. 

 The definite branches are also alternately and distichously branched 

 with those or the lesser orders, which are either simple or mostly 

 compound. By the successive ramification, the ultimate branches 

 remain filiform and monosiphonous, while the thicker ones are densely 

 corticated. Not seldom, there are also lesser sorts of branches, 

 either monosiphonous or thickly corticated, which are produced from 

 the ventral side of the shoter, definite branches. They are mostly 

 arranged without any definite order, or, in other times, in an inter- 

 rupted, single or double rows, and thus, the somewhat regular ar- 

 rancrement of the lesser sorts of branches in definite ones is disturbed. 

 All the apices of the longer and shorter branches are incurved toward 

 the ventral side of frond. The dorso-ventral character is well repre- 

 sented in the one-sided arrangement of cortical or monosiphonous 

 branchlets along- the outer side of branches arising from shorter, 

 definite branches, as it is shown in some ones on the left side of 

 Fig'. 6. Branches are attached to substratum by root-like organs 

 which are transformed from shortened and stunted branches. All the 

 sorts of branches are cylindrical, and densely coated, except ultimate 

 monosiphonous ones, showing 6 pericentral cells in cross-section. In 

 longitudinal section, two pericentral cells correspond to one axial cell, 



and each pericentral cell is covered by other two cells, every one of 



, メ 

 whicn, in turn, by other two, and so on. Ihus there is a pretty 



re<Tular arrancremeiit of cells both in cross and lonofltudinal sections. 



Stic aid ia are formed from terminal portion of definite and indehnite 



